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Dual Tech Occupancy Sensor 100 -347 VAC, center mount 360°

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Wattstopper’s low profile DT-355 dual technology occupancy sensor combines the benefits of passive infrared (PIR) and ultrasonic technologies. The sensor mounts on the ceiling with a flat, unobtrusive appearance and provides 360 degrees of coverage.

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  • Architecturally appealing low profile appearance
  • Ultrasonic diffusers give more comprehensive coverage
  • Operates at 120, 230 (single phase), 277 or 347 VAC, 50/60 Hz
  • Terminal wiring for quick and easy installation
  • Walk-through mode increases savings potential


General Info
Product Line Wattstopper
UPC Number 754182913848
Country Of Origin China
Features Indicator Lights, IR (Infrared), Motion Sensor
Application Sector Commercial
Warranty Type 5-Year
Product Width US 4.0 in
Product Weight US 0.45 lb
Product Volume US 71.25 cu in
Product Depth US 5.0 in
Product Height US 3.0 in
Additional Information
RoHS Conformant Yes This product meets the material restrictions of Article 4 of the RoHS Directive (2011/65/EU), including Commission Delegated Directive 2015/863.
DesignLights Consortium Qualified System Yes
Security   Yes This product is ioXt certified
Product Environmental Profile Yes
Technical Information
Sensor Type Occupancy
Indicator LED Light
Wattage 800 W
Sensing Range 360 degrees,1000 sq ft
Voltage 100 to 347 V
Connection Type Wired


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Questions & Answers

Is the watt stopper DT -355 suitable for damp locations? ? If not is there a model availability that is ? 

Asked by: Anonymous
No, the DT-355 is not suitable for damp locations. Please see the cutsheet for the HB30xW series sensors @ https://www.legrand.us/search/?text=HB3x0W. These are the sensors we do offer for wet locations.
Answered by: Justin
Date published: 2024-04-16


Asked by: MARK
Please see the image attached.
Answered by: Justin
Date published: 2024-02-26

 Is the DT-355 compatible with Lutron Homeworks when using a QSE-IO Interface?

Asked by: JF
The DT-355 is simply a line voltage, dual-technology occupancy sensor. You would need to contact Lutron to review their system requirements.
Answered by: Tier 1 Tech Support
Date published: 2024-01-30

Are either sensors replaceable?

Asked by: JeffS
the actual PIR and/or Ultrasonic sensors within the DT-355 are not field replaceable. If the sensor(s) have been damaged, the entire DT-355 would have to be replaced.
Answered by: Tier 1 Tech Support
Date published: 2024-01-22

Can you wire them together like the low voltage sensors 

Asked by: Derek68
Hi Derek, Multiple sensors can be wired in parallel. Please refer to the installation instructions for wiring diagram.
Answered by: Tier 1 Tech Support
Date published: 2024-01-18

Is there an ambient temperature rating for the DT355? Have a customer looking for a cold temperature rated line voltage ceiling sensor. Not outdoors.

Asked by: JB
Hello JB, Please review the following information regarding the operating temperature for part DT-355. Operating Temperature 32° to 131°F (0° to 55°C) Best Regards, Technical Support
Answered by: Justin
Date published: 2023-04-03

Can a switch or relay be added to keep these on during working hours and back to normal when after working hours?

Asked by: Jeff T
Hi Jeff, Sorry no, this sensor does not allow for work hours/night control. For more advanced sensor timing control you might want to consider the DLM line of products where this is achievable.
Answered by: Tier 1 Tech Support
Date published: 2023-03-07

I’m having issues getting the DT-355 to function properly after installing a new DT-355. Can you explain the function of the (light level and the ultrasonic sensitivity) features?

Asked by: Ben19
Hi Ben, Please reach out to our tech. support team for further assistance with programming the DT-355 or refer to the resources section of each product for cut sheets and detailed instructions for activating or de-activating product features. Legrand Technical Support: Phone: 1 800-879-8585, Option 3 then Option 1 Mon - Fri: 7am - 7pm CST (excluding holidays)
Answered by: Tier 1 Tech Support
Date published: 2023-03-07
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